The word "unintonated" is used to describe speech that lacks variation in pitch or tone. Synonyms for this term include "monotonous," "flat," "lifeless," "expressionless," "dull," and "deadpan." Other related words to consider include "monochromatic," "unvarying," "continuous," "uninflected," and "unemotional." These words can be used to describe speech patterns, but they can also be applied to other forms of communication or art. When seeking synonyms for "unintonated," it is important to consider the context in which the word will be used and to choose a term that accurately reflects the intended meaning or tone.